Application of response surface methodology for chromium removal by adsorption on low-cost biosorbent

Chromium(VI) Removal by Polyvinyl Chloride (PVC)/Aliquat-336 Polymeric Inclusion Membranes in a Multiframe Flat Sheet Membrane Module

“…Their analysis of the Pareto chart shows that quantity-activated carbon was the most influencing factor of the system. Similar outcomes were obtained by Ben Khalifa et al [44] using biosorbents based on orange peels, which could be explained by the increase in the number of active sites on the surface. Figure 8 presents the main effects of the different factors studied in the source phase.…”

A comparative study of acid‐treated, base‐treated, and Fenton‐like reagent‐treated biomass for Cr(VI) sequestration from aqueous solutions

“…The broad absorption peak at 3,330 cm −1 was accredited to adsorbed water and the presence of phenol and alcohol ‐OH groups in hemicellulose and lignin (Hossain et al, 2014; Saranya et al, 2018). The absorption peaks at 1,022 cm −1 could indicate the presence of –C‐O vibrations of carboxyl, primary and secondary hydroxyl in the biosorbents (Fathy, El‐Wakeel, & Abd El‐Latif, 2015; Khalifa, Rzig, Chakroun, Nouagui, & Hamrouni, 2019), while the peaks at 2,927/2,892 cm −1 were attributable to C‐H stretch of cellulosic alkane structures (Khalifa et al, 2019; Saranya et al, 2018). The main difference between MACA, MACB, and MACF is the absence of the absorption peak around 1,720 cm −1 in MACB.…”

Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

“…188 Some adsorbents recently reported in the literature are waste materials which are regarded as low-cost sorbents. Typical examples include eggshell powder, 189 orange peels, 190 coffee ground and mixed waste tea, [191][192][193] human hair waste 194 as well as rock wool. 4 The application of these adsorbents in water purication is advantageous in green chemistry perspectives as these are prevented from invading the environment.…”